/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/Widgets/SItemSelector.h
An optional delegate to compare two sections for equality which must be supplied when generating sections for items. This equality comparer will be used to collate items into matching categories.
WidgetArgsType & OnCompareSectionsForEquality &40; const FOnCompareSectionsForEquality & InDelegate &41;